| close | closes the branch with the specified id |
| closeAll | closes all branches in the tree |
| getOpenItems | returns ids of the opened branches |
| getState | returns the current state of the view |
| isBranchOpen | checks whether the specified branch is open or closed |
| open | opens the branch with the specified id |
| openAll | opens all branches in the tree |
| setState | restores the specified state of a view |